Efthimis Filippou, sometimes credited as Efthymis Filippou, is a Greek writer, whose work includes books, plays and screenplays. He is best known for his collaboration with director Yorgos Lanthimos, with whom he co-wrote the screenplays for Dogtooth, Alps, The Lobster, The Killing of a Sacred Deer and Kinds of Kindness. He was the winner of the Golden Osella Award for Best Screenplay at the 68th Venice International Film Festival in 2011, which he shared with Yorgos Lanthimos.